The cast of "Dancing With the Stars" (5/20/13)

In the final two-hour performance show, the remaining couples competed in three rounds of dance. In the first round, each couple took on a new routine in a dance style that the judges wanted to see again. In round two, the couples were challenged to a Cha Cha relay, where each pair danced to a different section of the same song. In the last round -- and one of the biggest competitive dances of the season -- the couples took on a supersized freestyle featuring special effects, additional dancers and unexpected surprises, on "Dancing with the Stars."